18473751. Bootstrapped Power Switch for a Negative Buck-Boost Low-side (Apple Inc.)
Bootstrapped Power Switch for a Negative Buck-Boost Low-side
Organization Name
Inventor(s)
Michael Couleur of Rottach-Egern DE
Bhanupriya Suresh of Munich DE
Bootstrapped Power Switch for a Negative Buck-Boost Low-side
This abstract first appeared for US patent application 18473751 titled 'Bootstrapped Power Switch for a Negative Buck-Boost Low-side
Original Abstract Submitted
A power converter with a bootstrapped switch is disclosed. A power converter is configured to generate a regulated supply voltage and includes an inductor coupled between a ground node and a switching node. The power converter further includes a switch (e.g., a low-side switch) coupled between the switching node and a supply voltage node, wherein the power converter is configured to generate the supply voltage on the voltage node, and a capacitor, wherein a voltage rating of the capacitor is less than a magnitude of the voltage. The power converter also includes a control circuit configured to, during a first phase, cause the capacitor to accumulate a charge, and during a second phase, cause activation of the switch by causing the capacitor to transfer a portion of the charge to a parasitic capacitance of the switch.